JP2017063465A - Method, user device and system for feeding back channel state information - Google Patents

Method, user device and system for feeding back channel state information Download PDF

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JP2017063465A
JP2017063465A JP2016219259A JP2016219259A JP2017063465A JP 2017063465 A JP2017063465 A JP 2017063465A JP 2016219259 A JP2016219259 A JP 2016219259A JP 2016219259 A JP2016219259 A JP 2016219259A JP 2017063465 A JP2017063465 A JP 2017063465A
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Prior art keywords
information
channel state
state information
instruction information
csi
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Japanese (ja)
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ジャン・イ
Yi Zhang
ワン・イ
Yi Wang
シュイ・ユエチアオ
Yueqiao Xu
リ・ホォンチャオ
Hongchao Li
ジョウ・ホア
Hua Zhou
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富士通株式会社
Fujitsu Ltd
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Abstract

The present invention provides a method, a terminal, and a base station for feeding back channel state information. A terminal receives a command information for aperiodic feedback of channel status information from the network side, and receives first channel status information and second channel status information according to the command information. It has the arrangement | positioning part mapped to a resource, and the transmission part which transmits the information mapped by the arrangement | positioning part. The arrangement unit combines the first rank instruction information included in the first channel state information and the second rank instruction information included in the second channel state information, and arranges them according to the cell ID. Map to resource. [Selection] Figure 1

Description

  The present invention relates to a technology in a communication field, and more particularly, to a method, a user apparatus and a system for feeding back channel state information.

  In LTE-A (Long Term Evolution Advanced) systems, CoMP (Coordinated Multi-point) transmission technology has been introduced to enhance user performance at cell boundaries and at the same time improve average cell throughput.

  LTE-A Rel.11 standardizes downlink CoMP technology for joint transmission (JT, Joint Transmission), dynamic transmission point selection (Dynamic Point Selection), and coordinated scheduling / beamforming (Coordinated Scheduling / Beamforming). Is going. In order to be able to accurately perform link self-adaptive transmission and effectively obtain the gain of CoMP transmission, the user equipment needs to accurately feed back to different transmission assumptions.

  Since the user apparatus is limited by the actual processing capability, the number of channel state indication (CSI) information to be uplink-reported (that is, report to the network side) may be limited. In CoMP transmission, since there are multiple CSI information corresponding to different transmission points and interference assumptions that need to be uplink reported, there is no effective method for uplink reporting of CSI information at present.

  An object of an embodiment of the present invention is to realize feedback of a plurality of CSI information during CoMP transmission by performing cascade connection to a plurality of CSI information in a bit field. It is to provide a method, a user apparatus, and a system for feeding back channel state information.

According to an aspect of an embodiment of the present invention, there is provided a method for feeding back channel state information for use in a CoMP transmission system, the method comprising:
This includes feeding back the channel state information to the network side by performing a cascade connection to one or more channel state information in the bit field.

According to another aspect of an embodiment of the present invention, there is provided a method for feeding back channel state information for use in a CoMP transmission system, the method comprising:
Select one channel state information from a set (set) of channel state information for instructing feedback; and transmit the selected channel state information and signaling indicating the selected channel state information to the network side Including doing.

According to another aspect of an embodiment of the present invention, a user device is provided, wherein the user device is
A feedback unit for feeding back the channel state information to the network side by performing a cascade connection in one or more channel state information in a bit field is included.

According to another aspect of an embodiment of the present invention, a user device is provided, wherein the user device is
A selection unit for selecting one channel state information from a set of channel state information for instructing feedback; and the selected channel state information and signaling indicating the selected channel state information to the network side Includes a transmission unit for transmitting.

According to another aspect of an embodiment of the present invention, a network system is provided, the system comprising:
Including a macro base station, one or more micro base stations (also referred to as pico base stations), and user equipment,
Among them, the user device is the user device described above.

  According to another aspect of an embodiment of the present invention, when a computer-readable program is provided and when the program is executed in a user device, the program transmits the channel state information described above to the computer in the user device. To execute the feedback method.

  According to another aspect of an embodiment of the present invention, a storage medium storing a computer-readable program is provided, and the computer-readable program feeds back the channel state information described above to the computer in the user device. Is executed.

  A beneficial effect of the embodiment of the present invention is that a feedback method of a plurality of CSI information during CoMP transmission can be realized. In addition, by performing encoding and mapping on the RI information and CQI information in the CSI information, it is possible to guarantee their reliable transmission. Also, considering the reduction of standardization work, the conventional feedback method of RI information and CQI / PMI information in LTE system is reused.

  The following description and drawings disclose specific embodiments of the present invention in detail, and clarify the forms in which the principles of the present invention can be employed. It should be understood that the embodiments of the present invention are not limited to those in scope. Also, within the spirit and scope of the appended claims, the embodiments of the present invention include all modifications, variations, and alternatives.

  Also, the features described and / or illustrated for one embodiment may be used in one or more other embodiments in the same or similar manner, combined with features in other embodiments, or other embodiments. The features in can also be replaced.

  It should also be emphasized that terms such as “inclusive / include”, as used herein, refer to the presence of a feature, device (entire), step or assembly, but one or more other features, devices (Overall) also refers to not excluding the presence or addition of steps or assemblies.

The above and other objects, features and advantages of embodiments of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.
3 is a flowchart of a channel state information feedback method in Embodiment 1 of the present invention. Flowchart of channel state information feedback method in Embodiment 2 of the present invention; It is a figure which shows the mapping relationship of a resource. It is a figure which shows the mapping relationship of a resource. 10 is a flowchart of a channel state information feedback method in Embodiment 3 of the present invention. 10 is a flowchart of a channel state information feedback method in Embodiment 4 of the present invention. 10 is a flowchart of a channel state information feedback method in Embodiment 5 of the present invention. FIG. 10 is a configuration diagram of a user apparatus in Embodiment 6 of the present invention. FIG. 8 is a configuration diagram of a feedback unit in FIG. FIG. 8 is a configuration diagram of a feedback unit in FIG. FIG. 10 is a configuration diagram of a user apparatus in Embodiment 7 of the present invention. FIG. 10 is a configuration diagram of a feedback unit in the seventh embodiment. FIG. 10 is a configuration diagram of a feedback unit in the seventh embodiment. FIG. 10 is a configuration diagram of a user apparatus in Embodiment 8 of the present invention.

  Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. In addition, the Example and its description which this invention illustrates are not for limiting this invention. In order that those skilled in the art can easily understand the principles and embodiments of the present invention, the embodiments of the present invention have been described by taking a channel state information feedback method of a CoMP transmission system as an example. The present invention is not limited to the system described above, but can be applied to other systems related to feedback of channel state information.

  At present, in LTE Rel. 10, periodic and aperiodic feedback methods are used to provide different granularity feedback information for user equipment and improve system performance. Of these, the aperiodic feedback method has the advantages of a large capacity and a small time delay, and therefore can meet the need for CoMP feedback. Therefore, in the present embodiment, an example will be described in which CSI information under different transmission points and interference assumptions is fed back by an aperiodic trigger in a CoMP transmission scenario.

  In this embodiment, the base station can trigger non-periodic CSI feedback by dynamic control information (DCI). Corresponding to CoMP transmission mode, when triggering in common search space, adopt 1-bit request field in DCI format 0 or DCI format 4 to trigger aperiodic CSI feedback Alternatively, when triggering in the user search space, a 2-bit CSI request field in DCI format 0 or DCI format 4 may be employed to trigger aperiodic CSI feedback.

In this embodiment, the aperiodic feedback during CoMP transmission may include one or more channel state information, of which each channel state information CSI includes the following information: rank indication (RI, Rank Indication) information, pre-encoding matrix indication (PMI, Precoding Matrix Indication) information, and channel quality indication (CQI, Channel Quality Indication) information. Among them, RI / PMI / CQI can adopt a plurality of different combinations due to different feedback modes. For example, as shown in Table 1, when PMI / CQI is discarded, the user equipment adopts mode 2-0 and feeds back wideband CQI, user-selected subband CQI information, and subband indication information. The user equipment may adopt mode 3-0 to feed back the wideband CQI and the subband CQI information of the upper layer configuration, and this type of configuration is used for the CoMP user equipment in the TDD system. Suitable for non-periodic feedback needs. When the PMI / RI is not discarded, the user equipment adopts mode 1-2 to feed back RI information, wideband CQI, and subband PMI information; or adopts mode 2-2, Feed back RI information, wideband CQI, and user-selected subband differential CQI information, subband selection indicator (ID) information, and wideband pre-encoding information; or adopt mode 3-1, RI information, Wideband CQI, subband CQI, and wideband PMI information are fed back.

  On the network side, for example, if the macro base station configures one non-zero-power CSI-RS resource and an interference measurement resource for each CSI, the user equipment performs CSI using these resources. The CSI can be measured and reported upstream. In CoMP transmission, it is necessary to uplink report a plurality of CSI information corresponding to a plurality of transmission points (TP) and interference assumptions. Among them, a plurality of CSI information may be multiplexed and transmitted on a physical uplink shared channel (PUSCH).

  At present, the user equipment is limited by the actual processing capacity, so the CSI to be fed back is also limited. In the present embodiment, the CSI information is fed back to the network side in a bit field in a bit field with respect to one or more CSI information. In this way, the above-mentioned problems existing so far can be solved and applied not only to CoMP scenarios, but also to multicarrier scenarios and aperiodic CSI information in a common space. It can also be applied to scenarios that trigger uplink reporting. Of these, depending on the actual situation, the UE feedback reception point may be a macro base station on the network side or all base stations on the network side. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, taking aperiodic feedback as an example.

  FIG. 1 is a flowchart of a channel state information feedback method in Embodiment 1 of the present invention. As shown in FIG. 1, the method includes the following steps.

  Step 101: The user apparatus UE receives instruction information of CSI information that is transmitted from the network side and that is fed back aperiodically.

  In this embodiment, the network side can instruct CSI information to be fed back aperiodically by DCI, and there is one or more CSI information to be fed back.

  In this embodiment, the macro base station on the network side or all base stations can all trigger aperiodic feedback. When there is one piece of CSI information to be fed back, the conventional Rel. 8 method can be adopted, and thus detailed description thereof is omitted here. Hereinafter, a case where one or more CSI information is fed back will be described.

  Step 102: Based on the instruction information, the UE feeds back the CSI information to the network side in a bit-field manner for one or more CSI information in a bit field.

  In this example, if aperiodic feedback is triggered according to a transmission point or a non-zero power CSI-RS resource, the user equipment supports multiple different interference assumptions in the aperiodic CSI set. If the aperiodic feedback is triggered according to the CSI information, the user equipment needs to uplink the corresponding CSI information. The above-described embodiment provides a method for realizing feedback of multiple CSI information during CoMP transmission. This allows feedback of multiple CSI information to the network without being limited by the processing capability of the user equipment. can do.

  In the present embodiment, step 102 employs a plurality of methods, and rank indication (RI) information, pre-encoding matrix indication (PMI) information, and / or channel quality indication (CQI) in the channel state information. ) Independent cascade connection in the bit field of information can be realized. Hereinafter, each will be described with reference to the drawings.

  FIG. 2 is a flowchart for feeding back CSI information according to the second embodiment of the present invention. As shown in FIG. 2, the method includes the following steps.

  Step 200: Since it is similar to Step 101, its detailed description is omitted here.

  Step 201: Arrange one or more CSI information in the source bit field.

  In this embodiment, one or more CSI information that needs to be fed back can be grasped based on the instruction information for instructing aperiodic feedback, and thus the CSI information that needs to be fed back. Can be arranged in a certain order in the source bit field.

  Among them, the RI information and the PMI / CQI information are respectively connected in cascade in the bit field.

  Step 202: Perform a corresponding process on the one or more CSI information after arrangement, perform mapping to a corresponding resource, and transmit to the network side.

  In this embodiment, different CSI information, for example, RI information and PMI / CQI information, respectively, adopt different encoding and mapping methods, and thus satisfy the performance requirements of RI and CQI / PMI. it can. The processing and mapping process is similar to the prior art. In this way, the standardization work can be reduced. Hereinafter, an example will be described.

  For example, for RI information, the block encoding in Rel.8 is adopted when the total number of bits after arrangement is 2 or less; when the number of bits is less than 12 and greater than 2, RM (Reed of (32, O) -Muller) encoding; when the number of bits is greater than 11, (32, O) bi-RM (Reed-Muller) encoding may be used. The encoded information obtains the necessary number of bits by adopting a cyclic shift. At the time of mapping, as shown in FIG. 3A, the RI information is mapped to four OFDM symbols close to DM-RS, that is, predetermined four OFDM symbols (for example, when the RI information is normal CP (1, 4, 7, 10) and according to extended CP (mapped to (0,3,5,8)), "first in time domain, then frequency domain (in reverse order on frequency domain)" Mapping in the order of. Since the encoding and mapping process is similar to that of the prior art, detailed description thereof is omitted here. In this way, the performance with which they can be estimated can be ensured and the transmission reliability can be improved.

  For example, for PMI / CQI information, (32, O) RM (Reed-Muller) encoding is used when the number of bits is 11 bits or less; when the number of bits is greater than 11 bits, After adding CRC, tail-biting CC (Tail-Biting Convolutional Coding (Encoding)) is adopted. The encoded information obtains the necessary number of bits by adopting a cyclic shift. In this embodiment, as shown in FIG. 3A, multiplexing and interleaving (interleaving) are performed on CQI / PMI information and PUSCH information (uplink data), and mapping is performed after the interleaving, When mapping, perform punching for resources occupied by RI information and ACK / NACK; when mapping uplink data symbols to physical resources, first map PMI / CQI information, then the remaining resources Uplink data mapping is performed above.

  In this embodiment, when RI information and PMI / CQI information are included in one or more CSI information, cascade connection is performed in the bit field for each of the RI information and PMI / CQI information, Process and map independently.

  As can be seen from the above embodiments, a plurality of CSI information feedback methods are provided during CoMP transmission. Under CoMP transmission mode, the source bit field is first sorted (also referred to as (Sort) array) for multiple CSI information, and then the corresponding encoding is performed based on the number of bits after sorting. And then mapping to the corresponding resource, thus feeding back the plurality of CSI information.

  FIG. 4 is a flowchart for feeding back CSI information according to the third embodiment of the present invention. As shown in FIG. 4, the method includes the following steps.

  Step 400: Since it is similar to Step 101, detailed description thereof is omitted here.

  Step 401: Encode each of one or more CSI information.

  In this embodiment, first, each CSI information in one or more CSI information is encoded, each RI information or PMI / CQI information is encoded, and the encoding method to be adopted is Since it is similar to Example 2, its detailed description is omitted here.

  Step 402: Arrange one or more post-encoding CSI information in a bit field.

  In the present embodiment, as in the second embodiment, sorting is performed on RI information and PMI / CQI information, respectively.

  Step 403: The one or more sorted CSI information is mapped to a corresponding resource and transmitted to the network side.

  In the present embodiment, similarly to the second embodiment, mapping is performed on RI information and PMI / CQI information, respectively, and the mapping process is similar to that of the second embodiment, and thus detailed description thereof is omitted here. .

  As can be seen from the above-described embodiment, under the CoMP transmission mode, each CSI information in the plurality of CSI information is first encoded, then sorted in the bit field, and then corresponding to it. It is possible to map to resources and thus feed back the plurality of CSI information.

  In the above-described embodiment, when sorting is performed in step 201 and step 402, sorting (rearrangement) may be performed in an arbitrary order. Further, sorting may be performed by the following method.

  1) When aperiodic feedback is triggered according to transmission points or non-zero power CSI-RS resources, when feeding back CSI information corresponding to multiple interference assumptions in the CSI information set, in a fixed order Sort.

  For example, first, sorting is performed in the order in which channel state information corresponding to non-zero power CSI-RS resources in the CSI information set is fed back.

  Thereafter, sorting is performed in the order of predetermined interference assumptions corresponding to each non-zero power CSI-RS resource, that is, sorting is performed in the order of feeding back the corresponding interference assumptions in the CSI information set. Taking three transmission points and two interference sources as an example, the fixed order is (interference open (open), interference open), (interference open, interference close (close)), (interference close, interference open), ( (Interference close, interference close)). Of course, this is only an example and may be in another order.

  As another implementation, this predetermined order of interference may be obtained by a higher layer configuration. For example, when a base station configures a CSI set to be fed back aperiodically, it has one configuration order for CSIs with different interference assumptions in the same non-zero power CSI-RS. This configuration order may be a cascade connection order. In other words, the feedback information corresponding to the previously configured CSI is placed in front, and the later configured CSI information is placed after.

  2) When aperiodic feedback is triggered according to CSI information, the user equipment needs to report the corresponding CSI information and sort in the order of the configured CSI information.

  In this embodiment, when two or two or more pieces of the same information exist in one or more CSI information, it is only necessary to hold one of the information, thus saving resources. .

  The methods described in the above embodiments can be used for single carrier scenarios. When feeding back CSI information on a multicarrier, the following method may be adopted.

  FIG. 5 is a flowchart for feeding back CSI information according to the fourth embodiment of the present invention. As shown in FIG. 5, the method includes the following steps.

  Step 500: The user apparatus UE receives instruction information of CSI information that is transmitted from the network side and is fed back aperiodically.

  In this embodiment, the network side may instruct CSI information to be aperiodically fed back by DCI. Under the multi-carrier scenario, the CSI information instructed by the instruction information and needs to be fed back is CSI information for feedback on different carriers, and CSI information for feedback under different transmission points and interference assumptions on the same carrier.

  Step 501: Cascade connection is made to one or more CSI information under the corresponding transmission point and interference assumption for each cell, respectively.

  In the present embodiment, when cascade connection is made to each cell, the methods described in the second embodiment and the third embodiment can be adopted, and thus detailed description thereof is omitted here.

  Step 502: Cascade connection is performed for CSI information of all cells requiring channel state information feedback.

  In the present embodiment, the CSI information of all the cells is arranged in the order of cell indicators (ID) from small to large, or from large to small.

  Step 503: Corresponding processing is performed on CSI information of all cells after cascade connection, mapping to corresponding resources is performed, and feedback to the network side is performed.

  Since this embodiment is similar to the processing and mapping method of Embodiments 2 and 3, detailed description thereof is omitted here.

  In the above-described embodiment, first, for each carrier, cascade connection is performed in a possible CSI set during CoMP transmission, and then, for all carriers, cascade connection is performed.

  In another embodiment, first, cascade connection (rearrangement of bits) is performed in the carrier area, and then, for each carrier, cascade connection is performed in a possible CSI set during CoMP transmission. The specific process is as follows.

  Cascade connection is made for channel status information of all cells requiring feedback of channel status information (arrayed for CSI information of all cells in order from cell small to large or from large to small) In each case, cascade connection is performed for one or more pieces of channel state information for feedback of each cell (the methods of Embodiment 2 and Embodiment 3 can be adopted); Channel state information after cascade connection Are mapped to corresponding resources and fed back to the network side.

  FIG. 3B is an example of one CoMP system. In the case of the combination of CoMP and CA, the cascade connection of one-stage carrier area is increased compared to FIG. 3A. Among them, FIG. 3B does not explain the cascade connection before and after encoding, but describes a sort order of sorting. Of these, the symbols “11” and “12” indicate the first CSI information and the second information of the first carrier, and the symbols “21” and “22” indicate the second carrier information. One CSI information and second CSI information are shown.

  As can be seen from the above-described embodiments, the above-described method can solve the feedback problem of CSI information under the combined scenario of multi-carrier and CoMP transmission, and by the combination of CoMP transmission and carrier aggregation technology, The user transmission rate can be improved.

  When the user equipment triggers a non-periodic CSI information uplink report in a common space, it can adopt the Rel.8 transmission method when only the single cell CSI information uplink report is triggered. There is no need to adopt the example method.

  Further, in order to obtain a good compromise between feedback overhead and system performance, the user apparatus may perform selection (selection) on a CSI information set that is configured by the base station and is to be uplinked aperiodically. it can.

  FIG. 6 is a flowchart of a method for feeding back channel state information according to the fifth embodiment of the present invention. As shown in FIG. 6, the method includes the following steps.

  Step 600: Receive indication information of CSI information sent from the network side and fed back aperiodically.

  Step 601: One CSI information to be fed back to the network side is selected from the CSI information set to be fed back indicated by the instruction information.

  In this embodiment, the user apparatus may select one optimum CSI information from the CSI information set based on the instruction information, for example, the CSI having the maximum transmission information amount.

  Step 602: Send the selected channel state information and signaling indicating the selected channel state information to the network side.

  In this embodiment, the signaling indicating the selected channel state information may be located after the pre-encoding matrix indication information and / or the channel quality indication information in the selected channel state information, Base signaling.

Of these, the number of bits is log 2 N , where N is the maximum number of bits, and the value of N is the number of configured non-zero power CSI-RSs, or a preconfigured aperiodically It matches the CSI number of CSI set that can be fed back.

  This kind of feedback method can be realized in a specific aperiodic feedback mode, for example, mode 2-2, but is not limited to such a mode.

  In this embodiment, in order to support backward compatibility in step 601, the user equipment can not only feed back one selected optimal CSI information, but also one single cell for backward compatibility. CSI information can also be fed back. Among them, the CSI information of the single cell for backward compatibility may be CSI information defined by the first non-zero CSI-RS, or the base station preconfigured for the user, aperiodic It may be the first CSI information in the CSI set that can be fed back to the CSI information. Alternatively, the single cell CSI information for supporting the backward compatibility may be a CSI that supports the backward compatibility and is configured directly by the upper layer. It may be determined by the resource. In the feedback process, the CQI feedback information portion in the optimal CSI information selected by the user is subjected to differential encoding with the CQI feedback information in the backward compatible CSI information, thereby reducing the feedback overhead. Further, in the CSI information to be fed back, one optimal CSI information selected by the user is arranged after the single cell CSI information for backward compatibility.

  As can be seen from the above-described embodiments, the CSI information that is fed back aperiodically can be fed back in a cascade connection manner in the bit field, and the joint transmission of CoMP and carrier is considered. It also provides a corresponding CSI feedback method. In addition, in order to obtain a compromise between feedback overhead and system performance gain, the user equipment selects the optimal CSI information in a selection scheme and also supports single backward CSI information to support backward compatibility. Can also be selected.

  It should be noted that the realization of all or some of the steps in the method of the above-described embodiment, which should be understood by those skilled in the art, may be completed by instructing the correlation hardware by a program. Such a program may be stored in a computer-readable storage medium, and when the program is executed, it may include all or some of the steps in the method of the above-described embodiment. RAM, magnetic disk, optical disk, etc. may be included.

  Embodiments of the present invention further provide user equipment that feeds back CSI information as described in the following embodiments. Since the principle that the user equipment solves the problem is similar to the above-described CSI information feedback method, the implementation of the user equipment can refer to the implementation of the method, and the duplicate description is omitted here.

  FIG. 7 is a diagram illustrating a configuration of a user device according to the sixth embodiment of the present invention. As shown in FIG. 7, the user apparatus 700 includes the following.

  Feedback unit 701: A system in which one or more CSI information is cascaded in a bit field, and is used to feed back the CSI information to the network side.

  In the case of CSI information to be fed back aperiodically, the user apparatus may further include a first receiving unit 702, which transmits CSI information to be fed back aperiodically transmitted from the network side. In this way, the feedback unit 701 is used to feed back CSI information based on the instruction information.

  In the present embodiment, the operation flowchart of the user apparatus 700 is the same as that described in the first embodiment shown in FIG.

  In the present embodiment, the feedback unit 701 cascades rank indication information and pre-encoding matrix indication information and / or channel quality indication information in the channel state information independently in a bit field. Since it is the same as that of the above-mentioned Example, it abbreviate | omits here.

  FIG. 8 is a diagram showing the configuration of the feedback unit in FIG. As shown in FIG. 8, the feedback unit 701 includes a first sort unit 801 and a first processing unit 802.

  The first sort unit 801 is used to arrange one or more pieces of CSI information in the source bit field. Among them, the arrangement method is similar to step 201 in the second embodiment, and thus detailed description thereof is omitted here. .

  The first processing unit 802 is used to perform a corresponding process on one or more CSI information after arrangement, perform mapping to a corresponding resource, and perform transmission to the network side. Among them, the processing and mapping process are similar to step 202 of the second embodiment, and thus detailed description thereof is omitted here.

  As can be seen from the above embodiment, when cascading one or more pieces of CSI information in a bit field, sorting is performed first, and after performing corresponding processing, mapping to corresponding resources and transmission It can be performed.

  FIG. 9 is a diagram showing the configuration of the feedback unit in FIG. As shown in FIG. 9, the feedback unit 701 includes a second processing unit 901, a second sort unit 902, and a third processing unit 903.

  The second processing unit 901 is used to encode each of one or more CSI information, and the method of encoding by the second processing unit 901 is as described in the second embodiment. Description is omitted.

  The second sort unit 902 is used to arrange one or more encoded CSI information in the bit field. Among them, the arrangement method of the second sort unit 902 is similar to those in the second and third embodiments. Then, detailed explanation is omitted.

  The third processing unit 903 is used to map one or more sorted CSI information to corresponding resources and transmit them to the network side. Among them, since the mapping method of the third processing unit 903 is as described in the third embodiment, detailed description thereof is omitted here.

  As can be seen from the above embodiments, when one or more CSI information is cascaded in a bit field, each encoding is performed first, then sorting is performed, and then mapping and transmission to the corresponding resource is performed. be able to.

  In the above embodiment, when the RI information and the PMI / CQI information are included in the CSI information, the first processing unit 802, the second processing unit 901, and the third processing unit 903 And PMI / CQI information is processed and mapped independently, and sorting is performed on each bit field.

  In the above embodiment, the first sort unit 801 or the second sort unit 902 further arranges one or more channel state information in the source bit field according to a fixed order or according to the order of the configured channel state information. Alternatively, one or more channel state information after encoding is arranged in a bit field, and details are as described in the above-described third embodiment, and thus detailed description thereof is omitted here.

  In the present embodiment, the first sort unit 801 or the second sort unit 902 performs a processing process when two or more identical information restricted by assumption exists in one or more channel state information. In order to simplify the process, one of the information is reserved.

  Hereinafter, a user apparatus that performs CSI feedback under a scenario of a combination of multicarrier and CoMP transmission will be described.

  FIG. 10 is a diagram illustrating a configuration of a user device according to the seventh embodiment of the present invention. As shown in FIG. 10, the user apparatus 1000 includes a receiving unit 1001 and a feedback unit 1002, and the functions of the receiving unit 1001 and the feedback unit 1002 are similar to those of the sixth embodiment, but the difference is that the receiving unit 1001 The CSI information requiring feedback indicated by the indication information received includes the CSI information requiring feedback on different carriers, the CSI information requiring feedback under different transmission points and interference assumptions on the same carrier.

  As shown in FIG. 11A, feedback unit 1002 specifically includes:

4th processing unit 1101: Cascade connection to one or more channel state information of each cell corresponding transmission point;
Third sort unit 1102: Cascade connection for channel state information of all cells;
Fifth processing unit 1103: Encodes new status indication information of all cells after cascade connection, maps to corresponding resources, and feeds back to the network side.

  Since the fourth processing unit 1101, the third sorting unit 1102, and the fifth processing unit 1103 in the above-described embodiment are similar to steps 501 to 503 in the fourth embodiment shown in FIG. 5, detailed description thereof is omitted here. .

  As shown in FIG. 11B, feedback unit 1002 specifically includes:

Fourth array unit 1101 ′: cascades channel state information of cells requiring feedback of all channel state information;
Sixth processing unit 1102 ′: cascades one or more channel state information for each cell, each of which requires feedback;
Seventh processing unit 1103 ′: Channel state information after cascade connection is mapped to a corresponding resource and fed back to the network side.

  In the present embodiment, the third sorting unit 1102 and the fourth arrangement unit 1101 ′ further arrange the arrangement for the channel state information of all the cells in the order of cell indicators from small to large, or from large to small. Do.

  Further, in order to obtain a good compromise between feedback overhead and system performance, the user apparatus can perform selection on a CSI information set that is configured by the base station and is to be uplinked aperiodically.

  FIG. 12 is a diagram illustrating a configuration of a user device according to the eighth embodiment of the present invention. As shown in FIG. 12, the user device 1200 includes a selection unit 1201 and a transmission unit 1202.

  The selection unit 1201 selects channel state information to be fed back to one network side from a preconfigured set of channel state information; the transmission unit 1202 is used to transmit the selected channel state information to the network side.

  In this embodiment, the transmission unit 1202 is used to transmit the selected channel state information and signaling indicating the selected channel state information to the network side.

  Among them, the bit-based signaling indicating the selected channel state information is located after the pre-encoding matrix indication information and / or the channel quality indication information in the selected channel state information.

  In order to support backward compatibility, the selection unit 1201 of the user equipment 1200 can also select CSI information of one single cell. Among them, the channel state information of the single cell for backward compatibility is the channel state information corresponding to the first non-zero power channel state indication reference signal resource, or the first channel state in the channel state information set. It is information, or the channel state information of the single cell for backward compatibility is determined by an anchor channel state information resource that supports backward compatibility and is configured by an upper layer.

  For aperiodic feedback, the user equipment 1200 further includes a second receiving unit (not shown), which transmits channel state information for aperiodic feedback sent from the network side. Specifically, the selection unit 1201 is used to receive the instruction information, and is used to select information state information to be fed back to the network side based on the instruction information.

  In the present embodiment, the operation processes of the selection unit 1201 and the transmission unit 1202 are similar to those of the fifth embodiment, and thus detailed description thereof is omitted here.

  As can be seen from the above-described embodiments, the CSI information that is aperiodically fed back can be fed back by adopting a cascade connection method in the bit field, and the joint transmission of CoMP and carrier can be performed. In consideration, a corresponding CSI feedback method is also provided. To further compromise feedback overhead and system performance gain, the user equipment can select the best CSI information in a screening manner, and one single cell to support backward compatibility. CSI information can also be selected.

  Embodiment 9 of the present invention further provides a network system, which includes a macro base station, one or more micro base stations, and a user equipment, wherein the user equipment is the above-described embodiment. Since it is a user device inside, detailed description is abbreviate | omitted here. The macro base station and the micro base station on the network side transmit instruction information for triggering aperiodic feedback to the user apparatus.

  Embodiments of the present invention further provide a computer readable program, of which, when executing the program in the user device, the program feeds back to the computer the channel state information described in the above embodiments in the user device. To execute the method.

  Embodiments of the present invention further provide a storage medium storing a computer readable program, wherein the computer readable program provides a method of feeding back channel state information described in the above embodiments to a computer in a user device. Let it run.

  In the above-described embodiment, the user device may be any terminal device such as a mobile phone, a PDA, a computer, or the like.

  The above-described apparatus and method of the present invention may be realized by hardware, or may be realized by a combination of hardware and software. The present invention also relates to such a computer-readable program, that is, when the program is executed by the logic unit, the logic unit can realize the above-described apparatus or component. Alternatively, the above-described various methods or steps can be realized in the logic unit. The present invention further relates to a storage medium storing the above-mentioned program, for example, a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, and the like.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to this embodiment, and all modifications to the present invention belong to the technical scope of the present invention unless departing from the spirit of the present invention.

Claims (7)

  1. A receiving unit that receives indication information of aperiodic feedback of channel state information from the network side;
    An arrangement unit that maps the first channel state information and the second channel state information to resources according to the instruction information;
    A transmission unit for transmitting the information mapped by the arrangement unit,
    The arrangement unit combines the first rank instruction information included in the first channel state information and the second rank instruction information included in the second channel state information, and arranges them according to a cell ID. The terminal is mapped to the resource as described above.
  2.   The arrangement unit includes first precoding matrix indication information included in the first channel state information and / or second precoding matrix indication information included in the first channel quality indication information and the second channel state information. A terminal that combines coding matrix indication information and / or second channel quality indication information and maps the information to be arranged according to a cell ID.
  3.   The arrangement unit includes a combination of the first rank instruction information and the second rank instruction information, the first precoding matrix instruction information, and / or the first channel quality instruction information and the first rank instruction information. 3. The terminal according to claim 2, wherein the second precoding matrix indication information and / or the combination with the second channel quality indication information are independently performed.
  4.   The arrangement unit arranges the first rank instruction information and the second rank instruction information in the order of the cell ID from large to small, according to any one of claims 1 to 3. The listed terminal.
  5.   The arrangement unit arranges the first rank instruction information and the second rank instruction information in the order of the cell IDs from small to large, according to any one of claims 1 to 3. The listed terminal.
  6. In an aperiodic feedback method of channel state information used in a CoMP transmission system,
    Receive indication information of aperiodic feedback of channel state information from the network side,
    According to the instruction information, the first rank instruction information included in the first channel state information and the second rank instruction information included in the second channel state information are combined and arranged according to the cell ID. And map to the resource as
    A feedback method characterized by transmitting information mapped to the resource.
  7. A transmission unit that transmits instruction information for allowing the terminal to feed back channel state information aperiodically;
    According to the instruction information, the first rank instruction information included in the first channel state information and the second rank instruction information included in the second channel state information are combined and arranged according to the cell ID. And a receiving unit that receives a signal mapped to a resource.
JP2016219259A 2016-11-09 2016-11-09 Method, user device and system for feeding back channel state information Pending JP2017063465A (en)

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